im not sure what to do or how to do it

lets say im at a loss now i feel unappreciated useless worthless and lazy but these arent just my thoughts my dh stays away b/c of my moods (hes told me so) i find his ex calling his cell phone and he quickly gets off the phone with her telling her its his days off somethign tells me i made a wrong turn somewheres and we aint in kansas anymore im still unsure what to do for all i care i think the marriage was over before it started i just want to know what to do